.tabs {
  height: 42px;
  display: grid;
  grid-template-columns: auto auto auto; //定义每一列的宽度
}
.tab-item {
  width: 100%;
  height: 100%;
  // border-top: 3px solid #2491f7;
  color: #ccc;
}
.tab-item:hover {
  background-color: #2d2f38;
}
